Pulverizer.



PATENTED AUG. 21, 1906.

IGQGLARK.

PULVERIZER.

APPLICATION FILED FEB. 3. 1904.

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PATENTED AUG. 21, 1906.

J. 0. CLARK. PULVERIZER.

APPLICATION FILED FEB. 3, 1904.

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JOHN c. CLARK, or ATLANTA, GEORGIA.

PULVERIZER.

Specification of Letters Patent.

Patented. Aug. 21, 1906.

Application filed February 3, 1904:. Serial No. 191.853.

To all whom it TIIIU/y concern:

Be it known that I, JOHN C. CLARK, a citizen of the United States, residing at Atlanta, Fulton county, Georgia, have invented certain new and useful Im rovements in -Pul verizers, of which the folfdwing is' a specification.

My invention relates to pulveriZing-mills, and more especially to mills having horizontal shafts about which rotate grinding-rings provided with rollers; and my invention consists in the construction and arrangement of these parts so as to secure both a crushing and a percussive action of the rolls by gravity and centrifugal force and in the combination with these features of crushers, as fully set forth hereinafter and as illustrated in the accompanying drawings, in which- Figure 1 is a longitudinal sectional elevation of a pulverizing-mill embodying my invention; Fig. 2, a transverse sectional elevation on the line 2 2, Fig. 1.

Referring to the drawings, it will be seen that the embodiment of the invention therein illustrated includes a horizontally-arranged driving-shaft A, mounted in bearings on suitable uprights B and having secured thereto two disks F, each forming one of the members of a crushing mechanism, the other member of which includes a ring G of greater interior diameter than the exterior diameter of the disk F by which it is supportedthat is, each crusher consists of a disk F, secured to and rotating with the shaft A, and a ring G, which incloses or surrounds the said disk and rests upon the top thereof. By this construction the rings G are frictionally driven from the disks F and suitable spaces are provided at the lower part of the crusher, which spaces communicate with hop ers I, through which material to be treated liy the a para 'tus is introduced. Such material will e car ried upward. as the shaft A rotates and crushed between the disk F and ring G. The crushed particles falling downward and being caught by the inner surface of the ring or escaping therefrom will pass laterally to a screen E, arranged at the inner side of each crusher. Preferably the disk F and ring G of each crusher are provided with tires or shoes 2 3, of hardened material, and the escape of the material from the crushers from the side opposite the screen E is prevented by a plate P, having a central opening for the shaft and hopper and connected at its periphery with a facing 6 of hardened material.

flanged guard J, which is bolted to the ring G of the crusher.

Between the screens E is supported a grinding-ring C, and upon the shaft A within said ring is mounted a cylinder K, having a The screens E expand or increase in diameter from the crushers toward said intermediate grindingring 0, so that material passing on tosaid screens from the crushers will be conducted to the interior of said ring, the finer particles falling through the screen into a chute or hopper H.

In order that the material conducted to the ring 0 may be pulverized, rollers L are arranged within said ring about the cylinder K, and means is provided for causing these rollers to rotate about the shaft A with the ring 0 and in succession to a position above the cylinder K and thereafter releasing the elevated roller, which will fall downward by gravity while being carried outward by centrifugal force and will crush the particles between it and the ring, as well as the particles between it and the cylinder, as long as it bears toward the cylinder.

Different means may be employed for carrying the rollers L above the axis of the shaft and for thereafter releasing them but, as shown, the ring C is provided with inwardlyextending cross-pieces or bearings 7, which engage said rollers and lift them upward until they bear on the cylinder K and roll them over the latter without interfering with their free descent after passing the vertical plane of the axis of the shaft,

The grinding-ring C is connected with the v rings G of the crushers by suitable braces 5 and is also driven from the shaft A by means of plates 8, secured to opposite sides of the cylinder K, and each provided with recesses 9, into which extend lugs 10 on the cross-pieces 7 of said grinding-ring.

All of the parts above described may be inclosed within a su table peripheral casing M and the shaft A driven by gears from a shaft N, provided with a driving and loose pulley, as shown.

It will be understood that the above-described apparatus may be used for either dry or wet grinding and that the speed of rotation is comparatively slow, but sufliciently rapid to throw the rollers L outwardly by centrifugal action.

' As shown, the opposing faces of the disks IIO F and rings ,G of thecrushers are beveled in opposite directions. They may, however, be otherwise formed with bearings to prevent motion in either direction longitudinally of the shaft A.

The drawings illustrate and the foregoing specifically describes one embodiment of the invention, in which is combined two crushers and an intermediate grinding-ring, screens E being arranged between said ring and the cru er embodied in a construction having but a single crusher and screen combined with the grinding-ring or where the screen or screens are di p n d W t Without limiting myself to the precise construction and arrangement of parts shown, I laim- 1. A pulverizing-mill provided with a rotating ring and shaft on which said ring is mounted, a cylinder within and concentric with the ring, loose rollers within said ring, and means on the ring whereby to carry said rollers successively to an elevated position onto the, cylinder and above said shaft and then release them to permit them to fall within the ring, substantially as set forth.

2. A pulverizing-mill provided with a rotating rin and shaft on which said ring is mountedfioose rollers Within said ring, a cylinder concentric with the ring, and means on the ring whereby .to carry said rollers successively to an elevated position ontothe cylinder and abQve said shaft and then release them, substantially as set forth.

3. The combination in a pulverizing-mill, of a horizontal driving-shaft, a grindingering mounted to rotate round said shaft, a cylinder upon the shaft concentric with the ring, loose rollers Within the rin and means on the ring for carrying the rol ers with the ring to, a position on top of the cylinder and thereafter releasing them substantially as set forth.

4. The combination in a pulverizing-mill, of a horizontal driving-shaft, a grinding-ring mounted to rotate round said shaft, a cylinder uponthe shaft concentric with the ring, loose. rollers Within the ring, means on the ring forcarrying the rollers with the ring to a position on top of the cylinder and thereafter releasing them, and means for feeding material to, be ground into the ring, substantially asset forth.

5. The combination in a pulverizing-mill, of a horizontal driving-shaft, a grindin -rm and screen mounted to rotate round sai shaft, looserollers within the ring, acylindjer on the shaft within the ring to support said rollersmeans for carrying the rollers with the ring. to. a position on top of the cylinder and thereafter releasing, them, and means, for feeding material to be ground over thescreen intothering, substantially asset forth.

6. The combination in a pulverizing-mill, f a orizontali h t a.g inding-ringorrying The invention may, however, be

rollers mounted to turn about the shaft, means for rotating said ring, crushers independent of the ring, and means whereby the material from the crushers is carried to the ring, substantially as set forth.

7. The combination in a pulverizing-mill, of a horizontal shaft, a grinding-ring carrying rollers mounted to turn about the shaft, crushers outside the ring, consisting of disks on the shaft, and crushing-rings greater in diameter than the disks and inclosin and suspended from the same, substantialy as set forth.

8. The combination in a pulverizing-mill, of a horizontal shaft, a grinding-ring carrying rollers mounted to turn about the shaft, crushers outside the ring, consisting of disks on the shaft, and crushing-rings greater in diameter than the disks and inclosing and suspended from the same, and connected with and carrying the ring, substantially as set forth.

9. The combination in a pulverizing-Inill, of a horizontal shaft, a grinding-ring carrying rollers mounted to turn about the shaft,

crushers outside the ring, consisting of disks on the shaft, crushing-rings greater in diameter than the disks and inclosing and suspended from the same and connected with and carrying the ring, and a screen between each crusher and the grinding-ring, substantially as set forth.

10. The combination in a pulverizing-mill, of a horizontal shaft, a grinding-ring carrying rollers mounted to turn about the shaft, crushers outside the ring, consisting of disks on the shaft having beveled edges, and bevelfaced crushing-rings greater in diameter than the disks, and inclosing and suspended from the-same, substantially as set forth.

11. The combination of the horizontal shaft, disks carried thereby having faces beveled in opposite directions, crushing-rings with bevel-faces larger in internal diameter than the disks and suspended therefrom, and a grindin ring connected with the crushingrings, rol ers within the ring and means on the ring to. elevate them, substantially as set forth.

12. The combination of the horizontal shaft, disks carried thereby, the face of one disk tapering in a direction the reverse of that of the other, crushing-rings with tapering faces and lar erin internal diameterthan the diameter 0 the; disks and suspended therefrom, a grinding-ring connected with the crushing-rings, screens between the crushing and grinding rings, and roller and means on; the ring to elevate them, substanti ally as set forth. 1

13. The combination of' the horizontal shaft, disksw carried. thereby, the faceof one disk tapering: in a. direction. the reverse of that of the other, crushing-rings with tapering facesand larger in internal diameter than the diameter of the disks and suspended therefrom, a 'grinding-ring connected with the crushing-rings, screens between the crushing andgrinding rings, rollers within the ring, and means on the ring for carrying the rollers with the ring and releasing them when in an elevated position, substantially as set forth.

14. The combination of the horizontal shaft, disks carried thereby, the face of one disk tapering in a direction the reverse of that of the other, crushing-rings with tapering faces and larger in internal diameter than the diameter of the disks and suspended therefrom, a grinding-ring connected -.with the crushing-rings, screens between the crushing and grinding rings, rollers within the ring, means on the ring to elevate them, and a cylinder carried by the shaft within the ring, substantially as set forth.

15. The combination of the shaft, grinding-ring mounted to turn about the shaft and carrying loose rollers, cross-bearings on the ring for engaging and lifting the rollers successively to points above the shaft and then releasing them, and means for positively drivin the ring from the shaft, substantially as set orth.

16. The combination of the shaft, grinding-ring mounted to turn about the shaft and carrying loose rollers, cross-bearings on the ring for engaging and lifting the rollers, side plates carried by the shaft and inclosing the rollers, and projections on the ring engaging bearings of the side plates, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

JOHN C. CLARK.

Witnesses:

EMMETT W. OOLLINs, HORACE A. JEssUP. 

